The most convincing argument against Common Core was given by Reagan Republican from Arizona, Sen. Al Melvin (R-Tucson):

Pressed by Bradley for specifics, Melvin said he understands "some of the reading material is borderline pornographic." And he said the program uses "fuzzy math," substituting letters for numbers in some examples.

If you start mixing up the letters and numbers the next thing you know they're going to try to multiply, and then who knows what the product will be!